Thio may refer to:
Science Thio-, a chemical prefix indicating the presence of a sulfur atom Thio, an abbreviation of thioglycolate broth
Places Thio, Benin, an arrondissement in Benin Thio, New Caledonia, a commune on the Pacific island Thio River, a river in New Caledonia
People Johnny Thio (1944–2008), Belgian footballer Thio Li-ann (born 1968), Singaporean law professor Thio Su Mien (1938–2025), Singaporean legal academic and lawyer Teoh, a Chinese surname sometimes rendered as "Thio"
Other Thio Sport, a New Caledonian football team